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Finding the Fourth Proportional to 397.12, 547.68 and 309.64

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Solution

The fourth proportional to 397.12, 547.68 and 309.64 is: 427.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.12 : 547.68 = 309.64 : x
  2. Step 2: Convert to fraction form
    397.12/547.68 = 309.64/x
  3. Step 3: Cross multiply
    397.12x = 547.68 × 309.64
  4. Step 4: Simplify right side
    397.12x = 169,583.64
  5. Step 5: Solve for x
    x = 169,583.64/397.12
  6. Step 6: Final answer
    x = 427.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.